Stockholders' Equity (Dividends Paid On Common Stock) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 23, 2013	Mar. 24, 2012
Dividends Payable [Line Items]
Date Paid	Dec. 31, 2012	Jan. 12, 2012
Per-Share Amounts (usd per share)	$ 0.175	$ 0.145
Total	$ 41.9	$ 43.8
Dividends Paid On Common Stock Member
Dividends Payable [Line Items]
Record Date	Dec. 17, 2012	Dec. 22, 2011